Bending machine



P. IB. WALLACE ET AL Nov., 113, w23.

BENDING MACHINE Filed spt. 22. 1920 3 Sheecs-Sheei'l 1 jjj Ven @WS 9 W m 1 w A n MM/ w m/ 5,. ww N Nov. E3 92@ 11,47%@3 P. B. WALLACE ET AL.

BENDING MACHINE Filed Sept. 2 2. 1920 3 Sheets-Sheet 2 ZIN/en @i F5 F. E. WALLAL'E Nov. 13, H923.

BENDING MACHINE Filed sept. 22. 1920 Wav IUI/@22 afs P. E. WALL AEE Patented Nov. i3, 1923.

naar Arg Leases .rarest4 ortica.

PHILIP B. WALLACE AND FRANK I-I. FOX, 0F SAN FRANCISCO, CALIFORNIA; SAID i FOX ASSIGNOR TO SAID WALLACE.

BENDING MACHINE.

Application filed September 22, 1920. Serial No. 411,595.

To all whom t 'may concern.'

Be it known that we, PHlLrP B. VALLACE and F RANK H. Fox, citizens ofthe United States, residing at San Francisco, in the county of San Francisco and State ofv California, have invented new .and useful Improvements in Bending Machines, of which the following is a speciication.

The present invention relates to improvements in machines for bending pipes, tubes, rods, and the like, into coils and other shapes.

An object of the invention is to provide a machine of the character `described with which pipe, etc., of various sizes may be more quickly and accurately bent or shaped without distorting the `pipe and 'without necessitating the heating thereof; the machine being simply constructed and arranged whereby strength of construction and ease and facility ofoperation are provided.

The invention possesses other advantages and features, some of which, with the foregoing will be set forth at length in the following description wherein we shall outline in full that form of the invention which we have selected for drawings accompanying and forming a part of the present specification. In sai-d drawings, we have shown one form of the construction of'our invention, but it is to be understood that we do not limit ourselves to such form, since the invention vas expressed in the claims may be embodied ina. plurality of forms.

- Referring to the drawings:

Figure lis a top plan View of the ma,- chine of this invention.

Fig. 2 is an enlarged fragmentary sectional view partly in -side elevation of the pipe clamp or vise, showing a piece of pipe held therein.

Fig. 3 is an enlarged fragmentary sectional view partly in side elevation of the bending block and operating means there- Fig. 4 is a side elevation of the machine.

Fig. 5 is a sectional view taken on theline 5 5 of Fig. 4.

Fig. 6 is a fragmentary vertical sectionalview taken through Fig. 5.

Fig. 7 is an enlarged fragmentary plan view `of a detail of the invention.

illustration in theA prises a table or base 1 having legs 2 secured y to a suitable base. A. plate or frame 3 1s mounted above the base 1 in spaced parallel relation thereto, being supported at one end by a vertical post 5, which post is fixed to the base 1. A pipe clamp or'vise 6 is adjustably mounted on the frame 3 so as to hold the pipe while it is being bent around a form 7, which latter is secured to thev post 5. Levers 8 and 9 are each pivoted to the post and the lever 8 carries a pressure block `10, which block engages and bends the pipe around the form as the levers are swinging on their pivots. The form is removable and the pressure block is radially adjustably mounted on the lever 8 whereby different sizes of pipe may be handled and various shapes produced.

The levers 8 and 9 are power o erated and may be driven by any suitabfe drive or operating means, although we prefer the gear drive from a motor as shown in the drawing. This drive comprises an electric motor 11 mounted on a base 12 to one side of the table 1. The motor shaft 13 carries a. pinion 14 which meshes with a gear'. 15 that is carried by a worm shaft 16 which worm shaft is journalled in suitable bearings in the table 1. rl`he worm shaft 16 meshes with a worm wheel 17 on a vertical shaft 18 which vertical shaft extends up through the table 1 and on its upper end carries a pinion 19. The pinion 19'meshes .with a large main gear 20, which gear is rotatably mounted on the post 5 below the frame 3. The lever 9 is open and the upper and lower sides thereof are pivoted to. the

intermediate 'its end on a pin 24 on the `lever 9. A link "26 is pivoted to the block and to a yswinging plate 26 attached to the as to facilitate the operation thereof. Ad-

justable means is provided for automatically declutching the lever 9 so as to prevent it from being moved entirely around with the gear and' to regulate the bending action. This means comprises a bar 27 adjustably mounted upon the lever 9 and at one end of which there is a downwardly opening hook portion 27a. A pin 27b is engaged in the hook portion 27a and joins the inner end of the lever 24 with the plate 26. The bar 27 has slots 28 therein, thru which slots bolts 29 extend so as to slidably hold the bar in place. A rocker member 30 is pivoted as at 31 upon the` lever 9 so that one'end thereof engages the inner end of the bar 27. The other end .of the rocker carries a release member 32 pivoted as at 33 at one end to the rocker and having a notch 34 in its outer end.

A leaf spring 35 tends to force the member 32 inwardly against a stop pin 36 on the rocker. A detent or .trip member 37 'is .adjustably held on the frame 3 by s et screws 37,', and is-in the path of the notched end of the release member 32. The trip 37 is actuately movable concentric with the axis of the main gear whereby the lever 9 may be made to travel to the desired extent before the automatic declutching takes place. Thisis varied to suit the particular work by changing the position ofthe trip or detent. l/Vhen the trip or detent engages the release 'member, the rocker is rocked and pushes the bar 27 outwardly. This,

\ and allows the throughv the lever 2,4 causes the block 22- to be' pushed out of contact with the gear 2O j gear to rotate without moving the lever 9. v

The lever 8 is open and formed oftwo parts with the inner, ends of said parts pivoted as at 38 to the shaft 5 and extend- `lng above and below the form. A link 39 is Apivoted at its'ends to, and connects, the outer ends of the levers 8 and 9 so as to communicate the pulling forceto the lever lever 8 and is adapted to move in an arc4 around the form, which latter, in this instance, is semi-annular. The block- 105is\ provided with a vpipe receiving groove 40 curved in cross section to permitthe pipe to snugly engage in the groove.` `A-holder V block 41 1s slidably mounted in the lever 8 outward of the pressure block l0 and at its' inner face is recessed as' at 42 so to receive and hold the pressure block 10 in place.' The holder 41 is recessed as at 43, said recess opening out on one side face and on the outer face of the holder. An L-shaped lever 44 is pivoted at the en d of its shorter angular portion as at; 45 to a block 46 in the lever 8. This lever v44 has a projection 47 intermediate of its ends and said projection is rounded, as at 48, at its free end. This rounded end is adapted to engage the inclined inner wall 49 of therecess 43. The recess is so cut that the projection will be past center when'in the position shown in F ig. 3, whereby the lever will have no tendency to be forced out of the recess 43 during the bending operation. The holder and block 46 are providedI with retaining flanges hold the holder and block 46 securely in the lever 8. The block 46 is adjustable longitudinally of the lever and its adjustment is regulated by a screw 51 turned through a member 52, which member is held adjustably on thearm 8 by bolts 52a. The screw 5l has an angular head 53 to ermit of the turning thereof with. a suitab e tool. The other end of the screw abuts the block 46. These adjustments are provided to accommodate the pressureblock and associated parts to pipesof various sizes. I

The vise or pipe clam'p comprises a block 55 slidable upon the frame 3 near one end of Ithe form. The frame has a longitudinal' slot 56 in which a bolt 57l is slidable. The lower end of the bolt has -al'nut 58 which engages the under kface of the frame. The upper end of the bolt is turned in a threaded opening 5.8 in the block 55. By tightening the nut, the block will be held in adjusted position. One side of the block 55,

has an extension 59 formed with a trans- .ably fastened to an adjustable hook 63.

The hook 63 is threaded and turned in an V opening therefor-formed'in an ear 64 provided 'on said block. In the atop of the block 55 an eccentric member 65 is mounted so that the chain extends over the ,topof 8. lThe bendlng or pressure block 101sv said member. An operating-lever or handle 66 1s provided for said eccentric so as to take up or let out on the chain, dependent upon the movement o-f the eccentric'. Pipe io be bent is placed inthe lpipe receiving groove/60 andthe chain is extended around said pipe so as to engage it as shown in Figure 2. By now turning the eccentric in the'properdirection, the-chain will be .caused `to grip the pipe and willeffect a pe'ration may be effectively carried out.

Vsecure holding thereof so' that the bending To prevent the block 55 from slipping, there is provided a stop member 67 which mal be a length of pipe or a bar or rod. his member 67 is laid upon the frame 3 with one end thereof in engagement with the rear of the block 55 and its other end is engaged 'with an adjustable stop screw 68.

vThe screw 68 is mounted in a lug 69 carried on the frame and is provided with an angular head 70 which provides for the turning of the screw with a suitable tool. not shown.

In the bperation of the machine, the form A lof the desired size and shape is secured upon' the vertical shaft and the vise or pipe holding means is adjusted in the frame 3 so as to be disposed in proper relation to the form., The pipe is then placed in the groove (30 therefor' on the block 55 and gripped by the chain 61 so as to be held against slipping in the vise. The levers 8 and 9'are moved around into substantiallyl and the clutch block 22 is moved so that the teeth 23 thereof mesh with the teeth of the main gear and the lever 9 will be carried around with the gear. By reason of the link connection of this lever with the levier 8, the latter lever is moved around with the arm 9. As the lever 8 moves from left to right, the pressure block 10 presses the pipe /inwardly around and upon the form. The trip member 37 is adjusted so as to release the clutch at a point predetermined whereby the bending operation will stop. Thus, as the lever 9 is carried around with the gear 20, and the release member 32 engages the detent or trip 37, by this engagement the rocker member is moved on its pivot so that one end thereof engages and pushes the bar 27 outwardly. This causes the clutch block 22 to move out of clutching position andthe lever 9 is disengaged from the main gear 20. Depending upon the shape and size of the bend, this automatic releasinfr action may be regulated as desided. he declutching may also b e manually 'effected by the use of the lever 24.. The regulat'lon is effected by setting the detentl at.

various points in the path of the releasing member 32. After one bending operation,

y the arms maybe turned by hand'to starting position and another bend given to the pipe after loosening the vise and adjusting the -pipe relative to the` vise. `By reason of the fact that both of the arms 8 and 9 have a common pivot on the post 5, and the form and gear 20 are likewise at their centers fastened to this vertical post, the bending .apparatus is compactly arranged and functions so that the bending takes place effectively and accurately' and without distorting the pipe.

To release the pressure block l0, the lever 44 is moved outwardly past center line of pressure so that the projection 47 of the lever 44 is moved. out of the recess 43. This permits the holder 41 to be moved outwardly on the arm 8`and permits of disengagement of the pressure block from the pipe. Vhen other sized pipe isused, another suitably grooved block is provided and interchangeability of the block is provided for by the construction of the holder in which the block is removably mounted.

Referring particularly to Figures 9 and 10, the modified form of the invention illustrated therein comprises a base 71 having a frame 72 extending in super-posed parallel relation thereto. UponV the base 71 is a motor 73 connected bysuitable gearing 74, after a manner which it is not believed necessary to illustrate in detail, with the 77 of the same construction as the vise in the preferred form of the invention. 78 is removably mounted upon the shaft 76 in any suitable manner. ln this modified form of the invention, instead of providing two pressure levers, use is made of a single lever 7 9 pivoted at the inner end to the shaft 7 G and arranged to operate in the plane of the bending form 78. This lever 79 extends considerably beyond the periphery of the gear 75 and is connected with said gear by a link, said link being secured to an intermediate portion of the arm at one end and to a point on the periphery of the gear 75 at its tion identical with that of the preferred foi-.m of theinvention The lever 84 .is pivoted. to a longitudinally adjustable block 85, which block is arranged to be moved by aset screw 86. The set screw-88 is adjustable through a block 87, which latter is longitudinally .adjustably mounted in thev bar 79. The adjustable. mounting'of the A form bloclr 87 is e-iected by use of two pins 88 which are adapted -to be .inserted through any one of a series of spaced openings in the nated 89 and controlled by a lever and link around said form, and a link connecting said mechanism 90. In starting the operation, the operator manipulates the clutch member 90 so as to drive the gear 20 from left to right and, at the end of the bending operation, for example, after the lever 79 has moved through' 900, the operator manipulates the clutch lever so as to reverse the direction of rotation of the gear 75. This returns the` arm to normal position and the operator then declutches thevmain gear by proper movement of the lever 90 so as to stop the movement ofthe lever 79.

We claim: i

l. A pipe bending machine comprising a frame, a pair of levers having a common ypivot on said frame, a form on said frame and around which pi e is adapted to be bent, means for holding t e pipe and the frame during bending operation, a pressure block carried by one of said levers and'arranged to engage pipe ,and bend it' around said form, means for moving the other of said levers levers.

2. A pipe bending machine comprising a frame, a pair of levers having a common pivot on said frame and arranged one above the other, a connection between said levers, a toothed gear on said frame, a clutch block slidable upon one of said levers, means for moving said clutch block into and out of engagement with the gear, a bending form on said frame, a pipe clamp on the frame, and

a pressure block on one of said levers arranged to engageand bend the pipe around said form.

3. A pipe bending machine comprising a frame, a 'pair of levers having a common pivot on said frame and arranged one above the other, a connection between said levers, a toothed gear on said frame, a clutch block slidable upon one of said levers, means for moving said clutch block into and out of engagement with the gear, a bending form on said frame, a pipe clamp on thevvframe and a pressure block on one of said levers.`

arranged -to engage and bend the pipe around saidtorm, and means for radially ad- ].ustably holding said block on said lever.

4. A pipe bending machine comprising a frame, a pair of levers having a common pivot on said frame and arranged one above the other, Aa connection between said levers,

a toothed gear on said frame, a clutch block gagement with the gear, a bending form on` said frame, a pipe clamp on the frame, and a pressure block on ne'of said levers'arranged to engage and bend the pipe around said form, and means operating automatically to declutch said clutch member when said levers have been moved a predetermined distance. Y

5. A pipe bending machine, a frame, a. gear, a vertical member upon which said gear is journaled, a pair of levers each pivoted at one end to said vertical member and being arrangedone above the other, a clutch member upon 4one of said levers, means for moving said clutch member into and out of engagement with the gear, a connection between said levers, a bending form on they frame, and means on one of said levers for engaging and bendingpipe around said eing arranged to operate in the plane of said form and the other in the plane of said gear, a connection between said levers, a pressure block for engaging and bending ipe around said form carried by one of said levers, a clutch member on the other` lever for engagement with the gear, and means for moving the clutch member into and out of clutching position. 7. A pipe'bending machine comprising a frame, a gear mounted horizontally upon said frame, a pair of levers having a common pivot in alinement with the axis of said gear,

a form on said frame, one of said levers being arranged to operate in the plane of said lform and the other in the plane of said gear,

a connection between said levers, a pressure block for engagin and bending pipe around said form carrie by one of said levers, a clutch member on .the other lever for engagement with the gear and vmeans for moving the clutch member into and out of clutching position, and means operating automatically when the gear is rotated a predetermined distance lto move said clutch member out of clutching position.

`.PHILIP B. WALLACE. FRANK H. FOX. 

